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I need to install a single version of Ubuntu on 2 USB flash drives, what is the best partitioning scheme to use for this situation? All I want to do on the flash drives are play minecraft, and use for minimal everyday things.

The current on I want to use is

/dev/sda = / 8 GB (My root)

/dev/sdb = /usr 8 GB (For my programs to install)

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up vote 3 down vote accepted

If you only want to play Minecraft and browse the web, this partitioning will do:

/dev/sda = /
/dev/sdb = unused

Alternatively, you could make a RAID 1 volume of the two disks to protect against the failure of one drive. A RAID 1 volume uses two (or more) disks with identical contents, so if one disk fails, you still have a working system. Or you could use the second drive to back up your data.

Separating /usr is not useful. On a typical desktop machine, /usr makes up the bulk of what is not /home. If you have little data on /home, with your scheme, you'd end up with /dev/sda almost empty. If you have a lot of data in /home, make it /dev/sdb.

If you need more than 8GB for the system, there's no particularly meaningful place to break it up. /usr/lib would be a good bet. Anyway, you can mount /dev/sdb wherever you like, and move one or more directories there and create a symbolic link.

Rather than pick a mount point, there's a simpler approach to splitting your system between two drives: make it a RAID 0 volume. RAID 0 combines two or more disks into one, in an arrangement that tries to spread the load evenly between the disks. The advantages of RAID 0 over a mount point is that you don't have to worry at all about choosing the mount point right for splitting the space evenly, and that it's a bit faster. The downside of RAID 0 is that if one of the disks fails, the whole filesystem will be unusable.

To install Ubuntu on a RAID volume, you'll need to use the server (alternate) installation media and do manual partitioning.

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i've done that partition map before and i ran out of room, i'll be install a few programs to make ubuntu "more convenient". i'll be using at least 9gb total – user146881 Mar 14 '14 at 0:44
i wont have too much stuff on /home, just maybe 1.5gb-2gb – user146881 Mar 14 '14 at 0:53
@user146881 If you need more than 8GB outside /home then the simplest by far is to install as RAID 0. See my edit. – Gilles Mar 14 '14 at 1:59

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